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TS 26.447 (SA4)
Codec for Enhanced Voice Services (EVS) –
Error Concealment of Lost Packets

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V16.0.0 (Wzip)  2019/03  82 p.
V15.0.0 (PDF)  2018/06  84 p.
V14.1.0  2017/06  86 p.
V13.2.0  2017/06  86 p.
V12.7.0  2017/06  86 p.

Rapporteur:  Dr. Bruhn, Stefan
See also:

The present document defines a frame loss concealment procedure, also termed frame substitution and muting procedure, which is executed by the Enhanced Voice Services (EVS) decoder when one or more frames (speech or audio or SID frames) are unavailable for decoding due to e.g. packet loss, corruption of a packet or late arrival of a packet.

full Table of Contents for  TS 26.447  Word version:   16.0.0


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1  ScopeWord-p. 6
2  References
3  Definitions, symbols and abbreviations
4  General
5  Detailed descriptionWord-p. 8
5.1  Concealment operation related to signal classification
5.2  Concealment operation related to spectral envelope (LPC) representationWord-p. 11
5.3  Concealment operation related to ACELP modesWord-p. 15
5.3.1  General
5.3.2  Concealment for bandwidth extension for ACELP modes
5.3.3  Guided concealment and recoveryWord-p. 28
5.3.4  Handling of multiple frame losses and mutingWord-p. 34
5.4  Concealment operation related to MDCT modesWord-p. 37
5.4.1  PLC method selection
5.4.2  TCX MDCT
5.4.3  HQ MDCTUp
5.4.5  Guided concealment and recoveryWord-p. 76
5.4.6  Handling of multiple frame losses and muting
5.5  SID frame concealment operation
A  Change historyWord-p. 82

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